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Investments in Unconsolidated Entities - Summarized Financial Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Combined summarized financial information for unconsolidated entities      
Current assets $ 311 $ 303  
Noncurrent assets 4,162 3,558  
Current liabilities 129 241  
Noncurrent liabilities 41 162  
Revenues 938 802 $ 769
Operating income 650 469 441
Net income $ 640 $ 452 $ 424